/* 弹性盒子横向为主轴 */
.flex-row{
	display: flex;
	flex-direction: row;
}
/* 弹性盒子纵向为主轴 */
.flex-column{
	display: flex;
	flex-direction: column;
}
/* 弹性盒子主轴居中 */
.justify-content-center{
	justify-content: center;
}
/* 弹性盒子副轴居中 */
.align-items-center{
	align-items: center;
}
/* 弹性盒子主轴空格环绕 */
.justify-content-space-around{
	justify-content: space-around;
}
/* 弹性盒子主轴空格间距 */
.justify-content-space-between{
	justify-content: space-between;
}
